ios - 通过传递数据。导航 Controller

Question

我正在尝试将数据传递给 viewController。问题在于它嵌入在 navigationController 中并以模态方式呈现。我如何传递给以模态方式呈现并嵌入导航 Controller 中的 viewController

func offerNew(sender: UIBarButtonItem) {


    let offerVC = self.storyboard?.instantiateViewControllerWithIdentifier("OfferViewController") as UINavigationController


    self.presentViewController(offerVC, animated: true, completion: nil);
}

我试过了

    let offerVC = self.storyboard?.instantiateViewControllerWithIdentifier("offerNavigation") as UINavigationController
    let targetVC = offerVC.topViewController as OfferViewController
    self.presentViewController(targetVC, animated: true, completion: nil);

Answer 1

我假设 offerVC 是嵌入了“目标” View Controller 的 navigationController。如果是这样，您的目标 View Controller 可以通过 offerVC 的 topViewController 属性访问。所以

let targetVC = offerVC.topViewController as TargetViewController

会给你一个引用。然后，您可以访问目标 View Controller 的属性。

编辑

但您应该提供 OfferVC - 它会自动显示 targetVC。

self.presentViewController(offerVC, animated: true, completion: nil);